Type-writing machine.



citizen of the United when set for ordinary end of the dog rocker with certain parts of being adapted to various styles of typewritinviTEn STATES rnTEnT caries.

HERBERT I-I. sTEELE, E MAnoE U's, NEW YORK, AssIcnoETo THE MONARCH TYPE- WRITER COMPANY, OF sYRAoUsE, NEW YORK, A CORPORATION on NEW YORK.

TYPE-WRITING MACHINE.

Specification of Letters Patent. if'atented J 1y 9, 1912,

Application filed lllay 9, 1911. Serial no. 625,957.

carriage 5. Said carriage is drawn toward the left by the usual spring drum (not shown) and its letter-feed motion is 0011- To aZZ whom it may concern:

Be it known that I, HERBERT H. STEELE, States, and resident of Marcellus, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in TypelVriting Machines, of which the following is a specification.

Iy invention relates to typewriting machines and more particularly to the carriage escapement mechanism.

The principal object of my invention is to provide a simple and eiiicient escapement for the carriage of a typewriting machine and one that can be readily converted to give either a reverse or an ordinary feed.

To the above ends my invention consists in certain features of construction and combinations and arrangements of parts, all of which will be fully set forth herein and particularly pointed out in the claims.

In the accompanying drawings, which are on an enlarged scale, Figure l is a side elevation of the escapement mechanism of a Monarch typewriter having my invention embodied therein and with somev of the parts shown invertical section. Fig. 2 is a rear elevation of the escapementmechanism with parts in section and parts broken away. Fig.3 is an isometric view of one of the feed dogs. Fig. 4 is a top plan view of the'upper which is mounted on arms 7 which are pivoted at 8 to the end pieces of the carriage. Said feed rack engages a feed pinion 10 on the forward end' of a shaft 11 journaled in a bracket 12. At its rear end said shaft has loosely mounted thereon an escapement wheel 13 and also, rigidly mounted thereon.

ratchet connection between the escapementwheel and the shaft. scribed are here shown as of the ordinary Monarch construction but as far as my invention is concerned they may be of any suitable construct-ion. The Monarch machine also has a bracket- 15 depending from the top plate and in which is pivoted the axle or cross shaft 16 of a dog rocker having an upwardly extending arm 17 and a ton wardly extending arm 18, the last connected by a link 20 with the universal bar of the machine. The dog r'ocker is held in its normal position by a spring 21 and its motion under the impulse of said spring is limited by a stop screw 22 and the motion of the dog rocker under the operation -of the link 20 is limited by a second stop screw 23, all of these parts being substantially as heretofore constructed.

I construct the upper end of the arm 17 of the dog rocker with a somewhat enlarged head 24 which, as here shown, is fiat on top except that it is formed with two horizontal. grooves 25 and 26 extending crosswise of themachine, as best shown in Figs. 4 and 5. These grooves are guide grooves for a pair of slides 27 and 28 having projecting upward therefrom teeth 30, 31, said teeth and slides constituting the feed dogs. that control the teeth of the wheel 13. In order to retain the slides in place in their grooves, each-of said slides is formed in one of its vertical faces with a longitudinal slot 33 and a hole is drilled in from one face of the head 24 and through the tongue or partition 34- that separates the two grooves 25 and 26. A pin 35 is forced through the hole in the partition 34 so that its forward end projects into the groove 33' in the slide 27, as shown the two dogs shown in section. Fig. 5 is-a view of the two dogsand the upper end of the dog rocker in fore and aft vertical section and looking toward the right, this view being on a larger scale than the others. Figs. 6, 7 and 8 are diagrammatic plan views showing the two dogs and two teeth of the escapement rack with the parts in different positions in the different views, and illustrating the action of the escapement when set for reverse feed. Figs. 9,110 and 11 are. views :of the same sort as Figs. 6, 7 and 8 but illustrating the action fofd the escapement My inventionis applicable or capable of 111g machines but it is here illustrated,'in connection with the Monarch typewriter. The main frame of the Monarch machine comprises a top plate 1 from which rise standards 2 which support stationary in Fig. 5, this pin. havinga tight fit in time grooved rails 3 which guide anti-friction head of the dog rocker. Another pin is pro; balls: or rollers '4 which in turn support a -vided for the rear slide 28 but thelatter pin trolled by means comprising a feed rack 6 a barrel 14 containing the usual pawl and The parts thus far desection in Fig.

In order tolimittlie s iding'imotion of the slides 27 and 28 int r direction, each of said slides is formedwitlrla depending finger 37 adapted to'strike-ag' ainst the righthand face of the head the dog rocker.

In order to limit the ntdtilqigp of" the slides in e the opposite direoii'iii, each of them is formed at its oppositeiend with a second depending arm 38; which last is shown in 4% These arms 38 play in vertical slots 40 and41lcut in the\head 24 of the dog rocker, as best shown in\Fig. 4, in which figure it'will be noted that the rear slot 41 is cut' deeper by a certain amount into the head-of the dog rocker than the forward slot 40 and also that the arm 38 of the rear slide is thicker bythe same amount in a right and left-hand direction than the corresponding arm of the forward slide. The slides 27 and 28'are impelled toward the left, that is to say, against the direction of motion of the lower part of the escapement wheel, by springs 42 seated in suitable bores 43 in the dog rocker and each at'its left-hand I end surrounding a p1n'44 projecting toward means'for holding one or theright from the arm 38.

In order to convert the escapement from reverse to ordinary or vice versa, I provide the other of the slides in a right-hand position against the tension of its spring 42. switch, here shown as consisting of a plate 45 of sheet Said plate is formed'with a concentric slot metal, is pivoted to the arm 17 of the dog rocker against the flat left-hand face of said arm on a shouldered and headed screw '46.

47 through which passes aheaded screw 48, said slot serving to limit'tliemotion of the plate about its pivot and said sciew when tightened serving also to hold the plate in either of its two positions. The upper end of the plate 45 has a finger 49-bent off horizontally therefrom, as shown, and serving when the plate is in Fig. 1, tolimit the right-hand motion of the rear slide 28, and when said plate is set or adjusted toits rear position, this finger 49 is out of the path of t-ive. The forward upper part of the plate 45 is formed with a holding device consisting, as here shown, of a second finger-50, which occupies the position shown in Fig. 1 and is bent as shown in Fig. 2; that is to finger is in front of the finger 49 and it is bent otl' first toward the left ,and thence upward, said finger 50 being adapted when the plate 45 is in its forward position, as shown, to engage to the left of the arm 38 of the forward slide 27 and to hold said slide in its extreme right-hand position, as

shown inFigs. 2 and 4. When the plate 45 this finger 50 is is set toits rear position,

38 of the rear adapted to engage the' arm the parts move the position shown in the dogs and 1nopera-.

slide 28 and to hold'said rear slide in its ex- The escapementis shownin-the drawings 7 set for reverse feed, this being'accomplished by setting the plate 45 to its forward positionand securing it there by tightening the screw 48. It will be noted' that when the parts are in this position the finger 49 stops the arm 38 of the rear slide 28 before said arm reaches the bottom-of the slot 41. The result is that when a keyis depressed and the rear dog 28-31 engages the wheel, said dog is arrested before the face thereof is quite even with the face 30. In-ot-her words, a slight drop is provided between the dog 31 and the dog 30.

of the forward dog Fig. 6 shows diagrammatically the normal position of the'parts when the escapement is set for reverse feed. In this and the other diagrammatic views one of the teeth of the escapement wheel is markeda and the next succeeding one is marked 1). It will be noted that thetooth a isin engagement with the dog 30 in Fig.6. When the key is depressed to the position shown in Fig. 7 where the tooth b has engaged thedog 31 and forced it as far to the right,i'or to the left as viewed in said figure, asit will go. When the key is released the parts move to the position shown in'Fig. 8v with, the-tooth bheldbythedog30.

In order to obtain an ordinary feed, the screw 48 is loosened and thel'p'late 45 is set to its rear position, first 'pres'siirgithe' slide 28'to the right so that it will be held in its right-hand position by the finger 50." 'When this is done the finger 49 moves out of the way of said arm 38 and the finger 50 holds said arm in the extreme'bottom of the slot position shown in Fig. 9 where it will be seen that the dog 30 has a' slight lead over' the dog 31. 'It will be perceived that the stop finger 49 serves to reverse the lead when the plate 45 is adjusted from one of its positions to the position the other. When the key is shown in Fig. 10 where the tooth ,a of the f,;-.'

escapement wheel; is held bythe'dog 31, said} tooth the'very slight drop between the two-dogs been moved towardthe When the key is released out of the path of the teeth a, the dog 30 moves into the-path of the tooth b, and the wheel and carriage make'their step and force the dog 30 back to its normal position where it holds the tooth b as shown in Fig. 11.-

noted that having been permitted to" move only distance'provided for by the The dog 30 has the dog 31 nioves n will be he mechanism is' left by its spring 42 1,032,090 Q very simple and that the device forchangarm is engaged against the tension of its mg from one style of feed to the other is exspring, and said switch having also a stop tremely simple. which, in one adjustment of said switch,

A single dog, similar to one of, the dogs here shown and mounted on the dog rocker in a similar way, is shown and claimed in my prior, pending application filed October 24th, 1910, Serial No. 588,682.

Various changes can be made in the details of construction and arrangement of the parts without departing from my invention. What I claim as new and desire to secure by Letters Patent, is

1. In a typewriting machine and in escapeinent mechanism, the combination of,

an escapement rack, a dog rocker, two dogs mounted to slide horizontall 7 von said dog rocker and having parallel depending arms, springs for sliding said dogs against the direction of motion of said rack, and a switch having a holding device engageable with said arms alternatively to hold the dog whose arm is engaged against, the tension of its spring.

2. In a typewriting machine and in escapement mechanism, the combination of an escapement rack, a dog rocker, two dogs mounted to slide on said dog rocker and each having an arm, springs for sliding said dogs against the direction of motion of saidrack, and a switch having a holding device engageable with said arms alternatively to hold the dog gaged against the tension of its spring, and

said switch having also a stop to reverse the lead between said dogs.

3. In a typewriting machine and in es- 'capement mechanism, the combination of ment of said switch to an escapement rack, a dog rocker two dogs mounted to slide on said dog rocker and each having an arm, springs for sliding said dogs against the direction of motion of said rack, and a switch pivotally mounted on said dog rocker and having two fingers, one arranged to engage one, face of one of said arms in one adjustment of said switch and the cor-responding face of of said arms in another adjusthold the dog whose the other to retain said whose arm is en- -day of May, A. D. 1911.

engages behind the arm of one of said dogs to reverse the lead between the dogs.

4.-In a typewriting machine'and in escapement mechanism, the combination with an escapement rack, of a dog rocker having two transverse grooves therein and a hole extending through one outer wall into one of said grooves and a registering hole through the'partition between said grooves,

two sliding dogs mounted in said grooves and each having a slot lengthwise thereof,

and pins in said holes engaging in said slots dogs in sald grooves.

5. In a typewriting'machine and in escapement mechanism, the combination of an escapement rack, a dog rocker, two dogs mounted on said dog rocker for motion relative to said dog rocker and each of said dogs having an arm and one of saidarmsi being thicker by a certain amount than the other, two parts on said of said dogs in one direction, one of said parts being deeper than the other by an amount corresponding to the difference in the thickness of said arms, springs for moving said dogs against 'the direction of motion of said rack, a holding device mounted on said dog rocker and adjustable to engage said arms alternatively on the sides of said arms opposite those which abut said dog rocker agaigist which said arms abut to limit the motion parts of said dog rocker to hold the dog whose arm is engaged against the tension of its spring, and a stop ad ustable to arrest one of said arms before it reaches its abutting part of the dog rocker when said holdmg device is adjusted to engage the other arm.

Signed at Syracuse, in the county of Onondaga, and State of New York, this 5th HERBERT H. STEELE.

Witnesses:

WILLARD C. HAY, BERNICE E. Fox.

a I I Copies of this patentmay be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

